Bit Operations using Macros

Code

#include <stdio.h>
#include <stdint.h>

// Define bitwise macros here
#define SET(reg) ((reg) | 0x84)
#define CLEAR(reg) ((reg) & ~(1<<3))
#define TOGGLE(reg) ((reg) ^ (1<<5))

uint8_t modify_register(uint8_t reg) {
    // Apply operations in order
    reg = SET(reg);
    reg = CLEAR(reg);
    reg = TOGGLE(reg);
    return reg;
}

int main() {
    uint8_t reg;
    scanf("%hhu", &reg);
    printf("%u", modify_register(reg));
    return 0;
}

Solving Approach